Improvement in saw-sharpening machines



J. WAGNER. Saw-Sharpening Machine.

- Pafe'nted April 9, 1878.

UNTTED STATES PATENT CEEIcE.

JOHN WAGNER, OF GRAND RAPIDS, WISCONSIN.

IMPROVEMENT IN SAW-SHARPENING MACHINES.

Specification forming part of Letters Patent No. 202,309, dated April 9,1878 application filed February 28, 1878.

To all whom it may concern.'

Be it known that I, JOHN WAGNER, of Grand Rapids, in the county of Woodand State of Wisconsin, have invented a new and Improved Saw-SharpeningMachine, of which the following is a full and accurate description,reference being had to the accompanying drawing.

The nature of my invention relates to a machine or apparatus for filingthe teeth of saws; and it consists, iirst, of a clamp for holding thesaw-plate, which clamp is tightened and held by a wedge-shaped plateinserted. between the clamp-legs, said wedge-plate being rst secured ina bench-vise; and, further, in the attachment of an adjustablefile-handle and guide, which will hold the file at the eX- act angle forall teeth alike, and will prevent the ling below the intended tooth-lineof the saw.

In the drawing, Figure 1 is a perspective view of the saw-sharpeningmachine ready for use. Fig. 2 is a cross-section, showing theconstruction of the saw-guide arrangement; and Fig. 3 is a section online .n n' in Fig. 2.

A and A are the two jaws of the saw-clamp, consisting each of a bar, a,with a smooth inner face, and with a T-groove, b, in its outward face,and having each two legs, c. Triangular projections d are xed to theinner sides of one pair of legs for holding the legs of the two separatejaws apart; and carriagebolts D are for holding the two jaws A and Altogether.

E is a plate, the ends of which are wedgeshaped, so as to enter betweenthe spreadapart ends of the legs, and close the clampjaws upon eachother. This plate E- is to be iirmly secured in a bench -vise, or by anyother means, so as to be stationary.

The saw is placed in the clamp by rst`- springing the jaws apart, whichis done by contracting their legs, and is iirmly held therein by placingsaid legs over the wedge ends of plate E, when, by pushing the clampdown- ;rgarl, the saw will be tightened and the clamp F is thefile-guide holder, which is secured to an oblong T-bar, f. This bar f isloosely iitted into the T-shaped grooves b ofthe clampjaws, so as toslide forward and back therein,

and permit a limited vibrating motion in a vertical direction. Theoutward end of the tile-guide holder is rounded and graduated withdegree-lines.

G is the guide for the Ele-handle, it being a tube, having a foot-pieceangular therewith, which is pivoted upon the holder F by a thumbscrew,I, passing through the latter into the former, for adjusting and holdingthe handleguide in any desired angle with the holder. The rear end ofthe guide G is entered into a ferrule, g, which has an annular groovearound its face. This ferrule g is surrounded by a ring, H, having athumb-screw, h, the point of which enters the annular groove in ferruleg, so that said ring cannot slide off, but will turn loose upon it, andcan be firmly secured in any desired angle by tightening the saidset-screw h. This ring H has an endwise-proj ecting radial plate, i.

K is the saw-tile, secured into the ferruled end of a cylindrical bar,L, placed through the tube of guide G, and having an oblong groove,entered by the radial plate i of ring H, so that said bar L can be givena reciprocating sliding motion, but cannot be rotated in said guide-tubeG without rst loosening the setscrew h, whereby the file-touch can beadjusted to the shape of the saw-tooth. The rear end of the cylindricalbar L is entered into a socket in handle M.

The modus operandi for using the above-described machine is as follows,to wit: The saw being properly adjusted in clamp A by means of asuitable gage, so that the saw-teeth will proj ect an equal distanceabove the clampjaws, and the clamp being placed over the wedge-plate,the file-guide holder is to be inserted in one of the T-grooves of theclamp, and the guide G is adjusted to the proper angle, when every othertooth of the saw is filed as long as the loose fit ofthe bar f in thegroove b will permit the le to scrape the tooth. After one-half of theteeth have thus been sharpened the clamp, with the saw in it, isreversed, and the Ele-handle holder is inserted into the oppositeT-groove b, and is adjusted again to the opposite similar angle, whenthe intermediate teeth are iiled in a similar manner.

As will be noticed, with this machine the operator cannot, in sharpeninga saw, do otherwise than le all the teeth to the same depth and on thesame an gle, the operation requiring neither skill nor a steady hand.

What l claim as my invention is- 1. The saw-clamp consisting of bars aa, legs c o c c, having projections d d and bolts D D, in combinationWith the Wedge-plate E, substantially as and for the purpose set forth.

2. In combination with a saw-clamp, substantially as described, andhaving T-shaped grooves, the holder F, guide Gr, ring H, setscrew h,radial plate i, bar L, handle M, and screw I, all constructed andarranged substanially in the manner and for the purpose set orth.

J OHNv YVAGNER.

Witnesses JOHN HAMM, CHAs. HAUsE.

